#include<iostream>
using namespace std;

class Box{
public:
    Box(void);
    Box(int h, int w ,int l){
        height = h;
        width = w;
        length = l;
    }
    int volume(void);
private:
    int height ,width, length;
};
Box::Box(void){
    height = 1;
    width = 2;
    length =3;
}
int Box::volume(void){
    return height*width*length;
}

int main(void)
{
    Box box1;
    cout<<box1.volume()<<endl;
    Box box2(2, 5, 10);
    cout<<box2.volume()<<endl;
    return 0;
}